add more tests on index_expression
add more tests on index_expression

seojungmin/peloton,AllisonWang/peloton,cmu-db/peloton,wangziqi2016/peloton,yingjunwu/peloton,AngLi-Leon/peloton,vittvolt/15721-peloton,ShuxinLin/peloton,seojungmin/peloton,seojungmin/peloton,vittvolt/15721-peloton,ShuxinLin/peloton,cmu-db/peloton,jessesleeping/iso_peloton,malin1993ml/peloton,prashasthip/peloton,wangziqi2016/peloton,phisiart/peloton-p3,eric-haibin-lin/peloton-1,AllisonWang/peloton,apavlo/peloton,cmu-db/peloton,malin1993ml/peloton,eric-haibin-lin/peloton-1,phisiart/peloton-p3,cmu-db/peloton,yingjunwu/peloton,cmu-db/peloton,PauloAmora/peloton,AngLi-Leon/peloton,ShuxinLin/peloton,jessesleeping/iso_peloton,PauloAmora/peloton,jessesleeping/iso_peloton,cmu-db/peloton,phisiart/peloton-p3,phisiart/peloton-p3,prashasthip/peloton,PauloAmora/peloton,eric-haibin-lin/peloton-1,ShuxinLin/peloton,apavlo/peloton,AllisonWang/peloton,haojin2/peloton,jessesleeping/iso_peloton,yingjunwu/peloton,malin1993ml/peloton,AngLi-Leon/peloton,apavlo/peloton,vittvolt/peloton,vittvolt/peloton,jessesleeping/iso_peloton,apavlo/peloton,haojin2/peloton,phisiart/peloton-p3,AngLi-Leon/peloton,ShuxinLin/peloton,eric-haibin-lin/peloton-1,apavlo/peloton,wangziqi2016/peloton,yingjunwu/peloton,seojungmin/peloton,vittvolt/peloton,prashasthip/peloton,seojungmin/peloton,apavlo/peloton,haojin2/peloton,ShuxinLin/peloton,jessesleeping/iso_peloton,eric-haibin-lin/peloton-1,prashasthip/peloton,vittvolt/15721-peloton,wangziqi2016/peloton,AngLi-Leon/peloton,PauloAmora/peloton,yingjunwu/peloton,AllisonWang/peloton,PauloAmora/peloton,vittvolt/15721-peloton,wangziqi2016/peloton,yingjunwu/peloton,haojin2/peloton,AllisonWang/peloton,malin1993ml/peloton,vittvolt/peloton,wangziqi2016/peloton,haojin2/peloton,vittvolt/15721-peloton,AngLi-Leon/peloton,jessesleeping/iso_peloton,prashasthip/peloton,seojungmin/peloton,malin1993ml/peloton,PauloAmora/peloton,haojin2/peloton,vittvolt/peloton,prashasthip/peloton,vittvolt/15721-peloton,phisiart/peloton-p3,malin1993ml/peloton,AllisonWang/peloton,eric-haibin-lin/peloton-1,vittvolt/peloton